Front and back driving tractor variable speed control mechanism

Abstract

The utility model relates to the technical field of tractor variable speed control, and discloses a front-back driving tractor variable speed control mechanism which comprises a main body mechanism and an auxiliary mechanism located at the inner end of the main body mechanism. The main body mechanism comprises a first front gearbox body, a first change gear fixing frame, a first change gear, a second change gear, a driving switching assembly and a rear gearbox body assembly, and the first change gear fixing frame is movably installed in the first front gearbox body. According to the front-back driving tractor variable speed control mechanism, a main body mechanism is installed, a first external gear is meshed with a first variable speed gear, at the moment, a tractor is in a front variable speed driving state, and when rear driving needs to be switched, a servo motor is started to drive a ball screw to rotate, so that a ball nut and the first external gear move rightwards; and at the moment, the tractor is in a rear-mounted variable-speed driving state, so that the flexibility of the device is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of tractor speed change control, in particular to a front and rear drive tractor speed change control mechanism. Background Art

[0002] Tractors are important pieces of equipment used for a variety of agricultural tasks such as tilling, plowing and harvesting. Selecting the right type of tractor transmission is essential to ensure optimal performance and efficiency of the tractor. Common tractor transmissions include manual, powershift and CVT, each with its own unique features and benefits.

[0003] The existing patent CN202100695U tractor gearbox operating mechanism Xianwen proposes that the utility model includes: a shift handle, a handle bracket, a shift flexible shaft, a gear selection flexible shaft, a flexible shaft bracket, a selector plate, a shift rocker arm, a gear selection crossbar, and a T-axis universal joint; the shift handle is fixedly connected to the T-axis universal joint, the T-axis universal joint is mounted on the handle bracket, and the shift handle can swing left and right and forward and backward relative to the handle bracket; the screws at both ends of the shift flexible shaft and the gear selection flexible shaft are respectively fixed on the handle bracket and the flexible shaft bracket, and are connected to the shift handle, the selector plate, and the shift rocker arm through a ball joint pair; the selector plate is mounted on the flexible shaft bracket, and a selector crossbar is installed on the selector plate, and the selector crossbar can move left and right. The use of this mechanism can realize three groups of gear selection positions and two shift positions in each group, and a total of six gear selections can be realized to meet the gear shifting requirements of multi-gear gearboxes. The shift handle, the handle bracket, the flexible shaft bracket and the shift plate arranged on the transmission case are connected through a flexible shaft, and the layout is reasonable and easy to use.

[0004] However, although the existing patent CN202100695U can realize three groups of gear selection positions and two shift positions in each group, a total of six gear selections can be realized to meet the gear shifting requirements of multi-gear transmissions. The shift handle, handle bracket, and flexible shaft bracket and shift plate arranged on the transmission body are connected through flexible shafts, which are reasonably arranged and easy to use. However, when the tractor works in different geological environments, it may have different use requirements for the drive mode. Utility Model Content

[0005] The utility model aims to provide a front and rear drive tractor speed control mechanism to solve the problem mentioned in the background technology that when the tractor works in different geological environments, there may be different use requirements for the driving mode.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a front-rear drive tractor speed control mechanism, comprising a main mechanism and an auxiliary mechanism, wherein the auxiliary mechanism is located at the inner end of the main mechanism, the main mechanism comprises a front gearbox body, a speed gear fixing frame, a first speed gear, a second speed gear, a drive switching assembly and a rear gearbox body assembly, the speed gear fixing frame is movably mounted inside the front gearbox body, the first speed gear is movably mounted on the right side of the speed gear fixing frame, the second speed gear is movably mounted on the right side of the speed gear fixing frame, the drive switching assembly is movably mounted on the right end of the front gearbox body, and the rear gearbox body assembly is fixedly mounted on the right end of the drive switching assembly; the drive switching assembly comprises a slot frame, a servo motor and a ball screw, the slot frame is fixedly mounted on the right end of the front gearbox body, the servo motor is fixedly mounted on the inner end of the slot frame, and the ball screw is movably mounted on the transmission end of the servo motor.

[0007] Preferably, the drive switching assembly also includes a ball nut, a transmission roller, an external gear 1 and an external gear 2, the ball nut is movably mounted on the outer end of the ball screw, and the external gear 1 is meshed with the first speed gear. At this time, the tractor is in a front speed drive state.

[0008] Preferably, the transmission roller is fixedly mounted on the upper end of the ball nut, the external gear one is movably mounted on the outer end of the transmission roller, the external gear one is meshedly connected to the first speed gear, and the external gear two is movably mounted on the outer end of the transmission roller. When it is necessary to switch the rear drive, the servo motor is started to drive the ball screw to rotate, so that the ball nut and the external gear one move to the right until the external gear two is meshed with the first driving wheel. At this time, the tractor is in the rear speed change drive state, which effectively improves the flexibility of the device.

[0009] Preferably, the rear gearbox body assembly includes a rear gearbox body 2, a speed gear fixing frame 2, a first driving wheel, and a second driving wheel. The rear gearbox body 2 is fixedly installed at the right end of the slot frame, and the rear gearbox body 2 is mainly used to install the rear drive assembly.

[0010] Preferably, the second speed gear fixing frame is fixedly installed on the right end of the inner end of the second rear gearbox body, the first driving wheel is movably installed on the left side of the second speed gear fixing frame, and the second driving wheel is movably installed on the left side of the second speed gear fixing frame, and the installation of the second speed gear fixing frame is used to limit the driving wheel.

[0011] Preferably, the auxiliary mechanism includes a limit block, a hydraulic device, a fixed shaft and a driving shaft, the limit block is fixedly mounted at the lower end of an inner end of the front gearbox body, and the installation of the limit block is mainly used to fix the hydraulic device.

[0012] Preferably, the oil pressure device is fixedly installed on the upper end of the limit block, the fixed shaft is fixedly installed on the left side of the oil pressure device, and the driving shaft is movably installed on the lower end of the speed gear fixing frame one. When the front drive speed change is required, the oil pressure device is started, and the driving shaft is driven to push the speed gear fixing frame one to move upward, so that the external gear one engages with the second speed gear, thereby realizing the speed change, which effectively improves the convenience of the device.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The front-to-rear drive tractor speed control mechanism, through the installation of the main mechanism, the external gear 1 is meshed with the first speed gear, at this time the tractor is in the front speed drive state, when it is necessary to switch to the rear drive, the servo motor is started, driving the ball screw to rotate, so that the ball nut and the external gear 1 move to the right, until the external gear 2 is meshed with the first driving wheel, at this time the tractor is in the rear speed drive state, effectively improving the flexibility of the device;

[0015] 2. The front and rear drive tractor speed control mechanism, through the installation of the auxiliary mechanism, the installation of the limit block is mainly used to fix the oil pressure device. When the front drive speed change is required, the oil pressure device is started, and the driving shaft pushes the speed change gear fixing frame to move upward, so that the external gear is engaged with the second speed change gear, and then the speed change is realized, which effectively improves the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;

[0018] Figure 3 This is a cross-sectional structural diagram of the front gearbox body of the utility model.

[0019] Figure 4 It is a schematic diagram of a partial cross-sectional structure of the utility model;

[0020] Figure 5 It is a schematic diagram of the partial three-dimensional structure of the drive switching component of the utility model.

[0021] In the figure: 1. main mechanism; 101. front gearbox body 1; 102. speed gear fixing frame 1; 103. first speed gear; 104. second speed gear; 105. drive switching assembly; 1051. slot frame; 1052. servo motor; 1053. ball screw; 1054. ball nut; 1055. transmission roller; 1056. external gear 1; 1057. external gear 2; 106. rear gearbox body assembly; 1061. rear gearbox body 2; 1062. speed gear fixing frame 2; 1063. first driving wheel; 1064. second driving wheel; 2. auxiliary mechanism; 201. limit block; 202. oil pressure device; 203. fixed shaft; 204. driving shaft. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-Figure 5The utility model provides a technical solution: a front and rear drive tractor speed control mechanism, comprising a main mechanism 1 and an auxiliary mechanism 2, the auxiliary mechanism 2 is located at the inner end of the main mechanism 1, the main mechanism 1 comprises a front gearbox body 101, a speed gear fixing frame 102, a first speed gear 103, a second speed gear 104, a drive switching component 105 and a rear gearbox body component 106, the speed gear fixing frame 102 is movably mounted inside the front gearbox body 101, the first speed gear 103 is movably mounted on the speed gear fixing frame The second speed gear 104 is movably mounted on the right side of the speed gear fixing frame 102, the drive switching assembly 105 is movably mounted on the right end of the front gearbox body 101, and the rear gearbox body assembly 106 is fixedly mounted on the right end of the drive switching assembly 105; the drive switching assembly 105 includes a slot frame 1051, a servo motor 1052 and a ball screw 1053, the slot frame 1051 is fixedly mounted on the right end of the front gearbox body 101, the servo motor 1052 is fixedly mounted on the inner end of the slot frame 1051, and the ball screw 1053 The drive switching assembly 105 further comprises a ball nut 1054, a transmission roller 1055, an external gear 1056 and an external gear 2 1057. The ball nut 1054 is movably mounted on the outer end of the ball screw 1053. The transmission roller 1055 is fixedly mounted on the upper end of the ball nut 1054. The external gear 1056 is movably mounted on the outer end of the transmission roller 1055. The external gear 1056 is meshedly connected to the first speed change gear 103. The external gear 2 1057 is movably mounted on the transmission roller 1055. 055, the rear gearbox body assembly 106 includes a rear gearbox body 1061, a speed gear fixing frame 1062, a first driving wheel 1063, and a second driving wheel 1064. The rear gearbox body 1061 is fixedly installed on the right end of the slot frame 1051, the speed gear fixing frame 1062 is fixedly installed on the right end of the inner end of the rear gearbox body 1061, the first driving wheel 1063 is movably installed on the left side of the speed gear fixing frame 1062, and the second driving wheel 1064 is movably installed on the left side of the speed gear fixing frame 1062.

[0024] The auxiliary mechanism 2 includes a limit block 201, a hydraulic device 202, a fixed shaft 203 and a driving shaft 204. The limit block 201 is fixedly mounted on the lower end of the inner end of the front gearbox body 101, the hydraulic device 202 is fixedly mounted on the upper end of the limit block 201, the fixed shaft 203 is fixedly mounted on the left side of the hydraulic device 202, and the driving shaft 204 is movably mounted on the lower end of the speed gear fixing frame 102. When the front and rear drive tractor speed control mechanism is used, the external gear 1056 is meshed with the first speed gear 103. At this time, the tractor is in the front speed drive state. When it is necessary to switch to the rear When driving, the servo motor 1052 starts, driving the ball screw 1053 to rotate, so that the ball nut 1054 and the external gear 1056 move to the right until the external gear 1057 is engaged with the first drive wheel 1063. At this time, the tractor is in the rear-speed transmission drive state. The installation of the limit block 201 is mainly used to fix the oil pressure device 202. When the front drive speed change is required, the oil pressure device 202 is started, and the driving shaft 204 pushes the speed gear fixing frame 102 to move upward, so that the external gear 1056 is engaged with the second speed gear 104, thereby realizing the speed change.

[0025] Working principle: When using the front and rear drive tractor speed control mechanism, the external gear 1056 is meshed with the first speed gear 103. At this time, the tractor is in the front speed drive state. When it is necessary to switch to the rear drive, the servo motor 1052 is started to drive the ball screw 1053 to rotate, so that the ball nut 1054 and the external gear 1056 move to the right until the external gear 2 1057 is meshed with the first drive wheel 1063. At this time, the tractor is in the rear speed drive state. The installation of the limit block 201 is mainly used to fix the oil pressure device 202. When it is necessary to change the front drive speed, the oil pressure device 202 is started, and the driving shaft 204 pushes the speed gear fixing frame 102 to move upward, so that the external gear 1056 is meshed and connected to the second speed gear 104, thereby realizing the speed change.

[0026] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A front and rear drive tractor speed control mechanism, comprising a main mechanism (1) and an auxiliary mechanism (2), characterized in that: The auxiliary mechanism (2) is located at the inner end of the main mechanism (1); the main mechanism (1) comprises a front gearbox body (101), a speed gear fixing frame (102), a first speed gear (103), a second speed gear (104), a drive switching assembly (105) and a rear gearbox body assembly (106); the speed gear fixing frame (102) is movably mounted inside the front gearbox body (101); the first speed gear (103) is movably mounted on the right side of the speed gear fixing frame (102); and the second speed gear (104) is movably mounted on the right side of the speed gear fixing frame (102). ), the drive switching assembly (105) is movably mounted on the right end of the front gearbox body (101), and the rear gearbox body assembly (106) is fixedly mounted on the right end of the drive switching assembly (105); the drive switching assembly (105) comprises a slot frame (1051), a servo motor (1052) and a ball screw (1053), the slot frame (1051) is fixedly mounted on the right end of the front gearbox body (101), the servo motor (1052) is fixedly mounted on the inner end of the slot frame (1051), and the ball screw (1053) is movably mounted on the transmission end of the servo motor (1052).

2. A front and rear drive tractor speed control mechanism according to claim 1, characterized in that: The drive switching assembly (105) further comprises a ball nut (1054), a transmission roller (1055), an external gear 1 (1056) and an external gear 2 (1057), wherein the ball nut (1054) is movably mounted on the outer end of the ball screw (1053).

3. A front and rear drive tractor speed control mechanism according to claim 2, characterized in that: The transmission roller (1055) is fixedly mounted on the upper end of the ball nut (1054), the external gear one (1056) is movably mounted on the outer end of the transmission roller (1055), the external gear one (1056) is meshedly connected to the first speed change gear (103), and the external gear two (1057) is movably mounted on the outer end of the transmission roller (1055).

4. A front and rear drive tractor speed control mechanism according to claim 3, characterized in that: The rear gearbox body assembly (106) comprises a second rear gearbox body (1061), a second speed change gear fixing frame (1062), a first driving wheel (1063), and a second driving wheel (1064); the second rear gearbox body (1061) is fixedly mounted on the right end of the slot frame (1051).

5. A front and rear drive tractor speed control mechanism according to claim 4, characterized in that: The second speed gear fixing frame (1062) is fixedly mounted on the right end of the inner end of the second rear gearbox body (1061), the first driving wheel (1063) is movably mounted on the left side of the second speed gear fixing frame (1062), and the second driving wheel (1064) is movably mounted on the left side of the second speed gear fixing frame (1062).

6. A front and rear drive tractor speed control mechanism according to claim 5, characterized in that: The auxiliary mechanism (2) comprises a limit block (201), an oil pressure device (202), a fixed shaft (203) and a driving shaft (204); the limit block (201) is fixedly mounted at the lower end of the inner end of the front gearbox body (101).

7. A front and rear drive tractor speed control mechanism according to claim 6, characterized in that: The oil pressure device (202) is fixedly mounted on the upper end of the limit block (201), the fixed shaft (203) is fixedly mounted on the left side of the oil pressure device (202), and the driving shaft (204) is movably mounted on the lower end of the speed change gear fixing frame 1 (102).

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